This patch adds dma controller node info on Exynos5420.
Exynos5420 has adma for audio IPs. As adma clk is dependent
on audss clk provider that will be added later.
Signed-off-by: Padmavathi Venna <padma.v@samsung.com> Signed-off-by: Leela Krishna Amudala <l.krishna@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>